I voted to close some example questions as "off topic" a week or so ago, and now some of my close votes are gone. Some other questions I've voted to close still show my close vote. Also, I can't re-vote to close, because I already did.
Is the "vote expiry" on Area 51 incredibly short? (This doesn't seem like the answer, because some of my other close votes are still around, but maybe I just don't accurately remember the order in which I VtCed)
If I need to point out some example questions I voted on, I can, but I'd rather keep my votes anonymous if possible.
EDIT: Example question is this one from the Sustainability Proposal that I (xiaohouzi79) posted as an off-topic example. It also has Flimzy's comment below added at the time the close vote was given.